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/* pvsdemix.c:
De-mixing of stereo sources.
Copyright (c) Victor Lazzarini, 2005
This file is part of Csound.
The Csound Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "pvs_ops.h"
#include "pvsdemix.h"
static int32_t fsigs_equal(const PVSDAT *f1, const PVSDAT *f2)
{
if ((f1->overlap == f2->overlap)
&& (f1->winsize == f2->winsize)
&& (f1->wintype == f2->wintype) /* harsh, maybe... */
&& (f1->N == f2->N)
&& (f1->format == f2->format)
)
return 1;
return 0;
}
#define FLOATMAX_ 3.402823466e+38f
static int32_t pvsdemix_init(CSOUND *csound, PVSDEMIX *p)
{
uint32_t N = p->finleft->N;
int32_t olap = p->finleft->overlap;
uint32_t M;
p->beta = (int32_t)(*p->slices);
if (UNLIKELY(p->finleft->sliding))
return csound->InitError(csound, Str("SDFT case not implemented yet"));
M = (N+2)*sizeof(float);
if (p->fout->frame.auxp==NULL || p->fout->frame.size<M)
csound->AuxAlloc(csound, M,&p->fout->frame);
M = M*p->beta;
if (p->left.auxp==NULL || p->left.size<M)
csound->AuxAlloc(csound, M, &p->left);
if (p->right.auxp==NULL || p->right.size<M)
csound->AuxAlloc(csound, M, &p->right);
M = (N/2+1)*sizeof(float);
if (p->maxl.auxp==NULL || p->maxl.size<M)
csound->AuxAlloc(csound, M, &p->maxl);
if (p->maxr.auxp==NULL || p->maxr.size<M)
csound->AuxAlloc(csound, M, &p->maxr);
if (p->minl.auxp==NULL || p->minl.size<M)
csound->AuxAlloc(csound, M, &p->minl);
if (p->minr.auxp==NULL || p->minr.size<M)
csound->AuxAlloc(csound, M, &p->minr);
p->fout->N = N;
p->fout->overlap = olap;
p->fout->winsize = p->finleft->winsize;
p->fout->wintype = p->finleft->wintype;
p->fout->format = p->finleft->format;
p->fout->framecount = 1;
p->lastframe = 0;
if (!((p->fout->format==PVS_AMP_FREQ) ||
(p->fout->format==PVS_AMP_PHASE)))
return csound->InitError(csound,
"pvsdemix: signal format must be amp-phase or amp-freq.\n");
return OK;
}
static int32_t pvsdemix_process(CSOUND *csound, PVSDEMIX *p)
{
int32_t n, i, n2, N = p->fout->N, imax;
int32_t framesize = N+2;
float sum = 0.0f,sig,g;
int32_t beta = (int32_t) p->beta, pos;
float *sigl = (float *) p->finleft->frame.auxp;
float *sigr = (float *) p->finright->frame.auxp;
float *out = (float *) p->fout->frame.auxp;
float *left = (float *) p->left.auxp;
float *right = (float *) p->right.auxp;
float *minl = (float *) p->minl.auxp;
float *maxr = (float *) p->maxr.auxp;
float *minr = (float *) p->minr.auxp;
float *maxl = (float *) p->maxl.auxp;
MYFLT azimuth = *p->pos;
MYFLT width = *p->width;
MYFLT range;
if (UNLIKELY(!fsigs_equal(p->finleft,p->finright))) goto err1;
if (UNLIKELY(out==NULL)) goto err2;
if (p->lastframe < p->finleft->framecount) {
if (width > beta) width = (MYFLT) beta;
else if (width < 1) width = FL(1.0);
if (azimuth < -1) azimuth = -FL(1.0);
else if (azimuth > 1) azimuth = FL(1.0);
imax = beta*framesize;
range = width/FL(2.0);
pos = (int32_t)((azimuth >= 0 ? azimuth : -azimuth)*beta);
/* create the azimuth amplitude vectors &
find the max/min values for channels, per bin */
for (n=0; n < N/2+1; n++) {
maxl[n] = maxr[n] = 0.0f;
minl[n] = minr[n] = FLOATMAX_;
n2 = n << 1;
for (i=framesize; i<=imax; i+=framesize){
g = (float) i/imax;
sig = sigl[n2] - g*sigr[n2];
left[n+(imax - i)] = sig = sig < 0 ? -sig : sig;
maxl[n] = maxl[n] > sig ? maxl[n] : sig;
minl[n] = minl[n] < sig ? minl[n] : sig;
sig = sigr[n2] - g*sigl[n2];
right[n+(imax - i)] = sig = sig < 0 ? -sig : sig;
maxr[n] = maxr[n] > sig ? maxr[n] : sig;
minr[n] = minr[n] < sig ? minr[n] : sig;
}
/* reverse the nulls into peaks */
for (i=imax - framesize; i >= 0; i-=framesize) {
left[n+i] = left[n+i] == minl[n] ? maxl[n] - minl[n] : 0.f;
right[n+i] = right[n+i] == minr[n] ? maxr[n] - minr[n] : 0.f;
}
/* the issue: a source found somewhere in one channel
will cause an image to be found in the opposite channel
around 0.
*/
/* resynthesise the signal
azimuth <= 0 => pos incrs right to left
azimuth > 0 => pos incrs left to right
*/
for (i = (int32_t)(pos - range); i < (pos+range); i++) {
if (i < 0)
sum += (azimuth <= 0 ? right[n+(beta+i)*framesize]
: left[n+(beta+i)*framesize]);
else if (i < beta)
sum += (azimuth <= 0 ? right[n+i*framesize]
: left[n+i*framesize]);
}
out[n2] = sum;
out[n2+1] = (azimuth < 0 ? sigl[n2+1] :
sigr[n2+1]);
sum=0.f;
}
p->fout->framecount = p->lastframe = p->finleft->framecount;
}
return OK;
err1:
return csound->PerfError(csound, &(p->h),
Str("pvsdemix : formats are different.\n"));
err2:
return csound->PerfError(csound, &(p->h),
Str("pvsdemix : not initialised\n"));
}
static OENTRY localops[] =
{
{"pvsdemix", sizeof(PVSDEMIX), 0, 3, "f", "ffkki",
(SUBR) pvsdemix_init, (SUBR) pvsdemix_process, (SUBR) NULL }
};
int32_t pvsdemix_init_(CSOUND *csound)
{
return csound->AppendOpcodes(csound, &(localops[0]),
(int32_t
) (sizeof(localops) / sizeof(OENTRY)));
}
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